Process of manufacturing colored portland cement



Patented Oct. 27, 1931" UNITED STATES;

ous'mv BERGEN, FELIX nnonnnaanrfaunnignnan ornnuxsw'rcx,

. GERMAN LI I PROCESS OF MANUFACTURING COLORED-PORTLAND No Drawing. Appllcation filed February 26, 1927, swam. 171,367, an d in Germany January 27,1927.

Our invention relates to improvements in,

the process of manufacturing colored Portland cement, and the object of the improvements is to provide a process, by means of which a weatherproof colored Portland cement can be manufactured at low cost.

With this object in view our invention consists in mixingea ground raw material suitable for manufacturing cement with substances such as phosphates, borates, or halogen compounds which when heat is-applied the materials are fluxed into molten matter, and in adding to the said raw material metal compounds such as oxide of chromium,

manufacture of the cement.

therea ter to remove the reduced iron by- In one example ofour improved rocess we mix the ground raw material wit fluor' for to the cement, we may make use of suitable raw materials containing a part or the whole of the coloring matter.

If the raw material contains iron oxide, we prefer to reduce the same into metal by burnin the material in a reducing flame, and

known methods.

Preferably the amount of the substances addedto the raw material is such that the sintering or melting point of the bricks is reduced.

Example 1.We mix 100 kg. of the ground raw material with 4 k of fiuor spar, 1 kg. of borax, and 0.5 kg. of chromium oxide, and burn the mixture at a sintering temperature in a furnace. The clinker thus" obtained is round and further treated for manufactur-v mg cement therefrom.

.Emam pZe 2."We mix100 kg. of the ground 1 raw: material withi kg. of 'fiuorspar, 1 kg.

of borax, and 0.5 kge-of chromium oxide,add 1 1 kg." of coke, and burn the-mixtureat a sintering'temperature in the reducing flame of a furnace; The clinkers. thusobtained is ground and further. treated for manufacturing cement'therefromr e The useof borax in conjunction :with metal oxides for coloring the clinker gives rise to:

a gyto. colored glass. a g g V With the use of sodiumphosphate simil the formation: of *colored borosilicates in reactions occur: as ffollows 1 nickel,'coba1t, copper and the like, which are 1 v adapted to color the clinker produced in the 1 .or

. a j e a-a0 cum- .auaro aoaogs or -(Nerd With j the oxidijzing use of one percent of chromium oxide produces a brlght green cement according to Example If V a weak reducingfiamebe-usedinconjunction With-anadmixtureof three-fourths percent ,of chromiumoxide according to Example 2 1 thenterrascotta' red cement is produced.

We claim V 1. process a of omma Portland cement comprising the steps of incorporating with the ground "limestone and clay a flux of the group consisting of phosphates, borates, and halogen compounds, also adding thereto a compound ofthe groupconsistihg of oxides of chromium nickel, cobalt and copper to re act with the flux to form coloring compounds and then, burning the mixture to form clinkers.

2. A process for the manufacture of colored Portland cement from raw materials containing iron said process comprising the steps of mixing With the ground raw materials a flux of the group consisting of phosphates, borates andhalogen compounds, also adding thereto a compound of the group consisting of oxides of chromium, nickel, cobalt and copper, burnj ing the mixture with a reducing flame to form 3. A process of making colored Portland cement comprising incor orating with the ground raw materials a ux and a coloring compound of the group consisting of oxides of chromium, nickel, cobalt and copper, and then burning the mixture to formclinke'r's whereby :the flux and the metallic oxides re: act to color the cement. V, v 4. A process as claimed in claim 1, the amount "of added substanoesbeing suchas to reduce the sintering or melting point materially. V

5. A process of making colored Portland cement comprising incorporating with the ground raw material containing iron, a flux and a coloring compound ofthe group consisting of. oxides of chromium, EIllGkBLiCObBli) land vcopper, burning theimi'xt'ure in ca reducin g flame,'-and cremoving t-he :metallic iiron.

Aprocess of making colored Portland cemeut comprising thesteps of incorporating withthe raw materialgfluor spar,borax and a compound of the groupconsistingofoxides :of chromium,'inickel,cobalt and copper, and then burningthe'mixture toform clinkers.

' 7. A' process of making: colored Portland cement com prising the: steps oftmcorporat-mg With the raw materials containing iron, fi'uor V spaigborax and acompoundaofthegroup-eonsisting of oxides of ClllOIIllllIIl, nickel, cobalt and copper, and i then burning the mixture with a reducing flame to form clinkers and 'to reduce the iron to metallic iormuand removing the metallic iron from theproduct. 1

8. A [process of "n'i-akingcolored Portland cement, comprising incorporatingin intimate mixture \v it'lrthe grountlfraw'mateiialsfiu ms of the group consist in gofborates phospllates and haldgen compounds 'and metallic colormg compounds which react with the *flux'es under heat treatment to color the cement,- mad burning the mixture.

In testimonywhereofwe havehereunto set our'hands. V A GUSTAV BERGEN.

DR. FELIX ENGEEHARDT. RICHARDfSTECKHAN. 

